Research on Seismic Response of High Hollow Pier of Railway Bridge Based on Opensees

The purpose of this paper was to ascertain the seismic response of high piers under the action of strong earthquake. Taking continuous girder bridge on railway as examples, based on seismic simulation software Opensees,considering higher-order vibration mode,this paper established a model of a high hollow pier of 90m in height and carried out nonlinear dynamic time-history analysis. Therefore, as the accelerated speed was adjusted from 0. 1g to 0. 6g,the change patterns of the pier top's displacement and pier bottom's bending moment were obtained,and the situation of formation and development of the plastic hinge was also obtained. The results show that:( a) As the accelerated speed is adjusted from 0. 1g to 0. 2g,0. 4g,0. 6g respectively,the pier top's displacement will increase by 1. 35,2. 79,4. 6 times respectively,while the pier bottom's bending moment will increase by 1. 49, 2. 54,3. 38 times respectively.( b) The pier bottom first gets into the plastic zone,followed by the middle part of the pier; then the length of the plastic zone spreads respectively towards the bottom and the top of the pier,while the spreading towards the top is faster and wider than towards the bottom. Therefore,the paper suggests that in the design of high pier,it is necessary to arrange sufficient stirrups not only at the bottom of a pier but at the middle part of the pier as well.